Martin, et al,
Try this approach:
The mission of the W3C Web Services Choreography Working Group is to define
a choreography language for specification of the acceptable sequences of
exchange of messages by participants as they attempt to achieve a desired
business transaction. The language must be expressed in XML. A
choreography specification must complement the WSDL service specifications
of participants. The choreography language should be able to express the
composition of more complex exchanges from simpler exchanges or subordinate
services.
A choreography specification should enable each participant to determine
alternative message types that the participant may send as the exchange
progresses as well as the alternative message types it should be prepared to
receive from other participant(s).
Fred
> -----Original Message-----
> From: Martin Chapman [mailto:martin.chapman@oracle.com]
> Sent: Tuesday, July 01, 2003 3:28 PM
> To: Steve Ross-Talbot; Yaron Y. Goland
> Cc: public-ws-chor@w3.org
> Subject: RE: Revised: Mission Statement
>
>
>
> I thought by our discussion at the F2F that the "in the
> middle of all of
> them" is not what we are after, and in effect equates to the
> O word. So I
> would be interested in a better understanding of what
> composition means,
> given that this approach would not really support a wrapper
> wsdl. I'm not
> arguing against composition here, just asking for some clarity.
>
> Martin.
>
> > -----Original Message-----
> > From: public-ws-chor-request@w3.org
> > [mailto:public-ws-chor-request@w3.org]On Behalf Of Steve Ross-Talbot
> > Sent: Tuesday, July 01, 2003 10:52 AM
> > To: Yaron Y. Goland
> > Cc: public-ws-chor@w3.org
> > Subject: Re: Revised: Mission Statement
> >
> >
> >
> > +1
> >
> > Having some understanding of the achitecture of this thing
> that we are
> > doing
> > would help us stay on the same page.
> >
> > If we have a global model then where does it sit with
> respect to any N
> > participants.
> > Is it in the middle of all of them?
> > Is it at each one's site?
> > Is it a proxy sort of thing?
> > Is it a web service itself?
> >
> > What happens when we have two of them and we wish to compose?
> > What happens to the originals?
> > Where does the new one reside?
> >
> > I could go on. It would just be nice to get a common
> understanding. I
> > have mine
> > but I'm not sure it's the same as other peoples.
> >
> > Cheers
> >
> > Steve T
> >
> > On Tuesday, July 1, 2003, at 06:33 pm, Yaron Y. Goland wrote:
> >
> > >
> > > The key issue for me is what does it mean to compose a
> web service?
> > > Does
> > > this mean a new WSDL with some computer behind it that
> then forwards
> > > requests to existing web services? Does this mean that a client is
> > > expected
> > > to send messages to different WS who all have some kind of
> > > relationship with
> > > each other? It's so vague that I'm not sure what scope we would be
> > > signing
> > > up for.
> > >
> > >
> > >
> > >> -----Original Message-----
> > >> From: Monica J. Martin [mailto:monica.martin@sun.com]
> > >> Sent: Monday, June 30, 2003 2:22 PM
> > >> To: Yaron Y. Goland
> > >> Cc: Francis McCabe; Burdett, David; Bonneau, Richard;
> Assaf Arkin;
> > >> Jean-Jacques Dubray; public-ws-chor@w3.org
> > >> Subject: Re: Revised: Mission Statement
> > >>
> > >>
> > >>>
> > >>>
> > >>> Goland: I don't understand what the terms service composition
> > >> and service semantics
> > >>> mean. Could someone please define them? Monica provides
> a whole mess
> > >>> of
> > >>> definitions but having 10 definitions is just as bad as
> having none.
> > >>>
> > >>> mm1: The definitions were a compilation on various types of
> > >> composition from the team. We have not settled on one
> > >> definition, although I have provided one below that seems
> > >> appropriate here for consideration. The definitions provided
> > >> span different areas of composition, and whether the team agrees
> > >> they are all the same, I can not speculate on. I think it
> > >> evidences the multiple levels of discussions that are occurring.
> > >> Don't shoot the messenger. I would propose: **A service
> > >> composition is a composition of services that results in a new
> > >> service. The new service can be the combination of distinct parts
> > >> to form a whole of the same generic type. The web services could
> > >> be combined to achieve a specific goal.* *This integrates parts
> > >> of the definitions of recursive, web service and choreography
> > >> composition.
> > >>> Monica
> > >>>
> > >>
> > >>
> > >
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